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Finding the Fourth Proportional to 255.72, 383.49 and 82.35

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Solution

The fourth proportional to 255.72, 383.49 and 82.35 is: 123.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.72 : 383.49 = 82.35 : x
  2. Step 2: Convert to fraction form
    255.72/383.49 = 82.35/x
  3. Step 3: Cross multiply
    255.72x = 383.49 × 82.35
  4. Step 4: Simplify right side
    255.72x = 31,580.40
  5. Step 5: Solve for x
    x = 31,580.40/255.72
  6. Step 6: Final answer
    x = 123.50

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.